What is a power line? What are the functional characteristics properties of power lines?

Power lines are cables, wires or other electrical equipment used to transmit electricity, which are mainly used to transmit electricity from power plants, substations and other power production facilities to the places where users are located, in order to meet people's demand for electricity. With the increasing demand for electricity, power lines have become one of the indispensable infrastructures of modern society. I. Functional Characteristics Transmission of Electricity The most important function of power lines is to transmit electricity. Through the power line, the power company can transmit the power generated by the power plant to the place where the user is located to meet people's demand for electricity. Therefore, the transmission capacity of power lines is one of the important indicators for power companies to choose power lines. Long-distance transmission power lines have the function of transmitting electricity over long distances. When electricity needs to be transmitted from a far place to the place where electricity is needed, the power line can transmit the electricity to the destination by means of transmitting signals. And this way of signal transmission can be either direct transmission or relayed through facilities such as substations. Supporting the operation of the power system Power lines also have the function of supporting the operation of the power system. The power system includes power generation, transmission, substation and distribution, etc., and the stability and safety of power lines, as part of the transmission link, play a vital role in the operation of the entire power system. Therefore, the power company will also consider its security and reliability indicators when choosing power lines. Second, the characteristics of the voltage level of high power line voltage level is generally higher, this is because in the transmission of electricity, power transmission distance is farther, need to overcome the transmission process of resistance and inductance and other losses, and improve the voltage level can reduce this loss, improve the efficiency of power transmission. At present, the voltage level of power lines is mainly divided into 110 kV, 220 kV, 500 kV and so on. Transmission distance long power lines can transmit power over longer distances, this is because the higher conductivity of power lines can overcome the attenuation of power in the transmission process. In the case of long transmission distance, the power company will use special transmission lines, for example, in the transmission lines of the AC transmission system, copper wires with high conductivity and low resistance and inductance are generally used to improve the transmission distance and transmission efficiency.

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